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  1. Astronomy

    Safe from a Heavenly Doom: Gamma-ray bursts not a threat to Earth

    Gamma-ray bursts are likely to occur in the Milky Way.

    By Ron Cowen
  2. Health & Medicine

    Bug Zapper: Novel drug kills resistant bacteria

    A newly recognized compound can wipe out some of the most troublesome antibiotic-resistant bacteria, lab tests show.

    By Nathan Seppa
  3. Paleontology

    Remains may be an evolutionary relic

    Fossils recently found in southwestern China may be of a lineage that originated long before the Cambrian explosion of biodiversity, when most major groups of animals first appeared in the fossil record.

    By Sid Perkins
  4. Earth

    Three Gorges Dam is affecting ocean life

    Oceanographic surveys suggest that China's Three Gorges Dam is already influencing biological productivity in the East China Sea, even though the structure is still under construction.